[GHC] #15125: Typeclass instance selection depends on the optimisation level

[GHC]

#15125: Typeclass instance selection depends on the optimisation level
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        Reporter:  nicuveo           |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.2.2
      Resolution:  duplicate         |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14434            |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * status:  new => closed
 * resolution:   => duplicate
 * related:   => #14434


Comment:

 Indeed, that is a separate bug, so I'd recommend opening a new ticket so
 that it does not get lost in here.

 Some advice for the future:

 * Make sure to post the complete code. The files in the original
 description leave off several details like the language extensions and
 module names. Without these, we have to reverse-engineer them, which is
 quite annoying.
 * Don't bother posting `stack.yaml` files or other extraneous things like
 that. An ideal reproducing test case is one where you can simply invoke
 GHC on some files to produce the issue. And you already have such a test
 case!

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15125#comment:10>
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